Question

calculate the resistance of aluminium wire of length 10m area of cross section is 2*10^-9 and the resistivity 2.63*10^-8

​

Answer 1

answer

d=10km=10×10

3

meter

d=2.0mm⇒ radius r = 1 mm = 1×10

−3

meter.

⇒ cross sectional area A=πr

2

=π×10

−6

m

2

So resistance R=

A

Pl

=2.7×10

−8

×

π×10

−6

10

4

Ω

⇒R=85.98Ω